# US 9,040,438 B2 · Low-viscosity aqueous adhesive polymer dispersions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,040,438 B2 - Document ID: US9040438B2 - Status: Granted - Kind: B2 - Application number: 12/193,832 - Filed: 2008-08-19 - Published: 2009-02-26 - Granted: 2015-05-26 - Earliest claimed: 2007-08-24 - Assignees: Bayer MaterialScience AG - Applicants: Dirk Achten; Peter Kueker; Juergen Kempkes; Bianka Lorenz; Peter Reichert; Winfried Jeske; Jose Colinas-Martinez - Inventors: Dirk Achten; Peter Kueker; Juergen Kempkes; Bianka Lorenz; Peter Reichert; Winfried Jeske; Jose Colinas-Martinez - Web page: https://patentgrep.com/patent/US9040438B2 ## CPC - C09J 111/02: Latex - C08K 3/36: Silica - C08L 11/02: Latex - C08K 3/26: Carbonates; Bicarbonates - Y10T 428/31645: Next to addition polymer from unsaturated monomers - Y10T 428/31696: Including polyene monomers [e.g., butadiene, etc.] - Y10T 428/31895: Paper or wood - Y10T 428/31924: Including polyene monomers - Y10T 442/30: Woven fabric [i.e., woven strand or strip material] - Y10T 442/40: Knit fabric [i.e., knit strand or strip material] - Y10T 442/60: Nonwoven fabric [i.e., nonwoven strand or fiber material] - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The invention relates to low-viscosity, low-monomer aqueous polymer dispersions based on polychloroprene, and a process for the preparation thereof and the use thereof as a contact adhesive. ## Claims ### Claim 1 An aqueous polymer dispersion comprising a concentration of polychloroprene of less than or equal to 40 weight % and a residual monomer content of less than 50 ppm, wherein said aqueous polymer dispersion has a viscosity of less than 50 mPas, a pH stability of greater than 2 hours, and the viscosity of said aqueous dispersion changes by a factor of less than or equal to 3 over the range of from 10 to 1,000 /s. ### Claim 2 (depends on 1) The aqueous polymer dispersion of claim 1, further comprising a total emulsifier concentration of less than 1.5 weight %. ### Claim 3 (depends on 1) The aqueous polymer dispersion of claim 1, further comprising from 0.1 to 5 parts by weight of ageing/oxidation stabilizers, based on a solids concentration of polychloroprene of 100 parts. ### Claim 4 (depends on 1) The aqueous polymer dispersion of claim 1, wherein said aqueous polymer dispersion has a Zn concentration of less than 0.24 weight %. ### Claim 5 (depends on 1) The aqueous polymer dispersion of claim 1, wherein said aqueous polymer dispersion has a pH of 8 to 10. ### Claim 6 (depends on 1) The aqueous polymer dispersion of claim 1, further comprising 40 to 100 parts by weight of silica/water-glass as a suspension of discrete particles in water, wherein the solids content of the silica suspension is used to calculate the parts and the polychloroprene solids content of a polychloroprene latex is set at 100 parts. ### Claim 7 (depends on 6) The aqueous polymer dispersion of claim 6, wherein said silicas are aqueous silicon dioxide dispersions, the SiO2 particles of which have a primary particle size of from 1 to 400 nm. ### Claim 8 (depends on 1) A process for preparing the aqueous polymer dispersion of claim 1, comprising a) continuously or discontinuously (co)polymerizing chloroprene in an aqueous emulsion, optionally with a defined amount of a regulator to form an aqueous polymer dispersion; b) removing residual monomers from said aqueous polymer dispersion down to a value of less than 50 ppm; c) optionally diluting said aqueous polymer dispersion with water; and d) optionally storing said aqueous polymer dispersion under temperature-controlled conditions and/or concentrating and optionally subsequently diluting said aqueous polymer dispersion with water. ### Claim 9 (depends on 8) The process of claim 8, wherein a) is carried out with 0 to 20 parts by weight, based on 100 parts by weight of chloroprene, of copolymerizable ethylenically unsaturated monomers in the presence of 0 to 1 mmol of a regulator, based on 100 g of monomer, at temperatures of 0 to 70 ° C. in said aqueous emulsion, the resulting aqueous polymer dispersion having a content which is insoluble in organic solvents of 0.1 to 90 weight %, based on the polymer. ### Claim 10 (depends on 8) The process of claim 8, wherein a) is performed as a batch process or as a continuous process. ### Claim 11 (depends on 10) The process of claim 10, wherein constituents are added in succession, simultaneously by means of static mixers/dynamic mixers, or combinations thereof, wherein the mixing times are less than 1 hour. ### Claim 12 (depends on 1) An adhesive composition comprising the aqueous polymer dispersion of claim 1. ### Claim 13 (depends on 12) The adhesive composition of claim 12, wherein said adhesive composition is applied by brush, roller, spray, or mist. ### Claim 14 (depends on 12) A substrate coated with the adhesive composition of claim 12. ### Claim 15 (depends on 12) A process for producing a wet-in-wet bond on foams, comprising (1) applying the adhesive composition of claim 12 to a substrate by means of spray, brush, or roller application and (2) generating a wet bond before film formation after an air-drying time of less than 5 minutes. ### Claim 16 (depends on 12) A process for producing a wet-in-wet bond on foams, comprising (1) applying the adhesive composition of claim 12 to less than 75 g/m2, based on polychloroprene, on a substrate surface by means of spray, brush, or roller application and (2) generating a wet bond before film formation after an air-drying time of no less than 5 minutes and prolonging the contact time to more than 5 min without a loss of function. ### Claim 17 (depends on 15) The process of claim 15, wherein (1) is achieved by conventional medium pressure spray application in the range of from 0.5 to 6 bar. ### Claim 18 (depends on 1) A process for producing composite materials, comprising bonding joint components with an adhesive composition comprising the aqueous polymer dispersion of claim 1. ### Claim 19 (depends on 1) A foam bond in mattress and furniture/upholstery comprising the aqueous polymer dispersion of claim 1. ### Claim 20 (depends on 1) A bonded substrate comprising the aqueous polymer dispersion of claim 1, wherein said bonded substrate is selected from the group consisting of wood, thermoplastics, elastomers, thermoplastic elastomers, vulcanisates, textile woven fabrics, knitted fabrics, braided fabrics, metals, and stoneware, which have been concreted with one another and/or on to porous substrates having a density of less than 1 kg/liter.